I have reached at level 3 of Yahoo Answers by answering questions regarding Tally. It had took me 7 months to reach there because people ask very few questions regarding Tally. You can see what people want to know about Tally from my Best yahoo answers . People have asked from what is Tally to configuration of Tally. Most frequently asked question was from where to download the crack of software or from were they can get the serial nos of tally. Another popular question was regarding learning tally. During search i found one link where you can get Tally 9 install file and Tally 7.2 install file.
Check out my all questions if they can help you.

For the existing users of Tally 7.2 users New release is on the site for downloading. You can download release 3.13 of Tally 7.2. The update is accompanied with stat version 47 which is applicable to release 3.0 and higher. As far as release is concern few minor up gradations and few corrections has been done for existing users. User must read full release notes before installing the new release. If you need any of these upgraded or modified features then download the same by giving your sr. no. and the activation code or email address. Users can check their current statutory master by pressing Ctrl+Alt+B at Gateway of Tally Menu. As discussed earlier also stat.slk file contains latest statutory rules and up gradations regarding VAT,Service Tax etc, it should be upgraded.

Some of the major facilities and enhancements include:-
display of due date in purchase entry,
importing VAT rate specified in item master,
VAT bifurcation details in sales invoice and accurate calculation of tax for multiple VAT rate items etc.

Some major stat changes incorporated in Stat file are:-
VAT return forms RT II and RT III have now been provided for Bihar
New VAT classifications has been added.
Modification and deletion in existing VAT classifications
Forms 8, 8A and 8B have now been provided for Kerala.
New VAT classification for VAT 20% added for Kerala.
Capital Goods 12.5% has now been provided in VAT/Tax Classes for Rajasthan.
New VAT Classifications have been provided, in order to make voucher entry convenient for Haryana.

You can get pdf version of release notes of stat 47.

Related readings : Download New version Tally 9, Sate version 46 released

In most of the cases if a Tally user formats his PC then the most common reason is virus attack or too much spywares which hampers the normal processing of computer. The most major factor of infection is your internet connection. Faster is your internet connection faster would be the data transfer rate and faster would be the infection rate. Few tips and timely measures would say you the day and insure some level of security for your PC.
As festival season is approaching in the western countries the virus attacks or maleware attacks would increase. This msdn page makes you aware about internet frauds. This article at blogs tells about avoiding phising techniques. This page at Microsoft's site tells about 4 easy steps to protect your computer. The four steps include keeping a firewall between your computer and internet, keeping OS updated, use antivirus, and use anti spyware technology.

Firewall
As far as firewall software is concern, Windows firewall can protect upto certain extent but a good fire wall software like Zone Alarm would give you choice to figure out each and every software which is using internet and facility to block and allow the use of Internet. You can get Zone Alarm firewall for free of cost.

Antivirus
The best anti virus choice depends on you and your experience. But what ever anti virus you use regular update is required to prevent new virus from attacking your computer. This page at labnol tell about free anti virus scanning. You can try some of the sites mentioned and see which one can work for you.

Anti spyware
For best anti spyware my best based on my experience is SpyBot. This software is free to download as well as very much effective. Like updating antivirus you have to update spyware list also and Spybot updates its list constantly. More over it can protect from internet explorer hacks, and can controll the windows registry keys. when ever a new entry is added in registry or deleted from windows registry you would get noticed and you can allow or deny particular action. It would warn you when ever a programe is putting an entry in startup or in internet explorer defaults etc.

Browser :
If you are fed up of frequent search pages automatically coming up in your internet explorer or certain pop ups automatically open some adult sites or automatic homepage configuration, then the only answer is to either switch to latest internet explorer or give firefox 2 a try. You would feel the difference. You can download Firefox 2 which is having dictionary support like MS word. You can download Firefox with google toolbar for easier surfing by clicking the Firefox button on left panel under useful software.

The combination of these softwares can secure your pc like anything.
Last but not the least you can get few tips about protecting your pc at this page on University of torento site and see how this person Clinton Forbes claims to be having virus free computer without having anti virus softwares.